Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 83bd2e2..4ec2c02 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -854,7 +854,7 @@
 
 /*
  * Optimise SD flags for power savings:
- * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
+ * SD_BALANCE_NEWIDLE helps aggressive task consolidation and power savings.
  * Keep default SD flags if sched_{smt,mc}_power_saving=0
  */